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Chapter 9: Problem 4

Why are endocrine signals transmitted more slowly than paracrine signals? a. The ligands are transported through the bloodstream and travel greater distances. b. The target and signaling cells are close together. c. The ligands are degraded rapidly. d. The ligands do not bind to carrier proteins during transport.

Short Answer

Expert verified
a. The ligands are transported through the bloodstream and travel greater distances.

Step by step solution

01

Understand the Types of Signals

Endocrine signals involve hormones that are released by endocrine glands and transported through the bloodstream to reach distant target cells. Paracrine signals involve the release of signaling molecules that affect nearby target cells.
02

Analyze the Distance

Consider the distance the signal must travel. Endocrine signals must travel through the bloodstream, covering a greater distance than paracrine signals, which only affect nearby cells.
03

Examine the Transport Medium

Endocrine signals are transported through the bloodstream, which takes time. Paracrine signals are typically transmitted through extracellular fluids or directly from cell to cell.
04

Evaluate Each Option

a. Because endocrine ligands travel greater distances through the bloodstream, this option supports the slower transmission.b. This option describes paracrine signals, not endocrine signals.c. Rapid degradation of ligands would lead to faster, not slower, signal transmission.d. Whether ligands bind to carrier proteins during transport doesn't significantly affect the overall transmission speed of endocrine signals.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Signal Transduction
Signal transduction is the process by which a chemical or physical signal is transmitted through a cell as a series of molecular events. These events typically involve a cascade of biochemical reactions carried out by proteins, leading to a cellular response. The key steps in signal transduction are:
  • Reception: A signaling molecule, or ligand, binds to a specific receptor on the cell surface or inside the cell.
  • Transduction: The binding of the ligand causes a change in the receptor that triggers a series of intracellular signaling events.
  • Response: The cell responds to the signal by altering its behavior, such as changing gene expression, metabolism, or cell division.
Different types of signaling pathways, such as endocrine and paracrine signaling, determine how the signals propagate through the body and the response generated. Understanding these differences is crucial for comprehending why some signals are fast and others are slow.
Hormone Transport
Hormone transport is essential for endocrine signaling. Hormones are chemical messengers produced by endocrine glands and transported through the bloodstream to reach target cells located in distant parts of the body. Since endocrine signals must cover large distances:
  • Endocrine hormones are often carried by binding to specific carrier proteins to protect them from rapid degradation and ensure they reach their targets effectively.
  • This process takes more time compared to other forms of cell communication because the bloodstream acts as the medium, which requires the hormones to move through the circulatory system.
The mechanism of hormone transport highlights why endocrine signals are slower than paracrine signals, which are transported over shorter distances via extracellular fluids directly between cells without the extensive travel.
Cell Signaling Distance
The distance between signaling and target cells is a pivotal factor in determining the speed of signal transmission. Cell signaling can be categorized based on this distance:
  • Endocrine signaling: Involves long-distance communication. Hormones released by endocrine glands travel through the bloodstream to reach distant cells. The large distance taken by the signal explains its slower transmission compared to other types.
  • Paracrine signaling: Involves short-distance communication. Signaling molecules are released from one cell and affect target cells nearby, usually within the same tissue. This proximity enables faster transmission.
  • Autocrine signaling: A cell targets itself, meaning the signaling molecules affect the same cell that releases them. This process is typically very fast because the signal does not need to leave the cell.
Each type of signaling serves different functions depending on the physiological context and needed response time, making understanding the signaling distance essential for differentiating endocrine from paracrine signals.

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Most popular questions from this chapter

Give an example for each one of the following effects of a cell signal: on protein expression, cellular metabolism, and cell division. a. protein expression: binding of epinephrine (adrenaline) to a G-protein- linked receptor; cellular metabolism: the MAP-kinase cascade; cell division: promoted by the binding of the E G F to its receptor tyrosine kinase b. protein expression: the MAP-kinase cascade; cellular metabolism- binding of epinephrine (adrenaline) to a G-protein-linked receptor; cell division promoted by the binding of the EGF to its receptor tyrosine kinase c. protein expression: binding of the E G F to its receptor tyrosine kinase; cellular metabolism: the MAP-kinase cascade; cell division: FASRAS signaling. d. protein expression: RAS signaling; cellular metabolism: binding of the EGF to its receptor tyrosine kinase promotes an increase; cell division: binding of epinephrine (adrenaline) to a G-protein-linked receptor.

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Why are ion channels necessary to transport ions into or out of a cell? a. Ions are too large to diffuse through the membrane. b. Ions are charged particles and cannot diffuse through the hydrophobic interior of the membrane. c. Ions bind to hydrophobic molecules within the ion channels. d. Ions bind to carrier proteins in the bloodstream, which must be removed before transport into the cell.

The hormone insulin binds to a receptor tyrosine kinase on the surface of target cells. Which of the following steps takes place before phosphorylation of tyrosine residues? a. A tyrosine kinase enzyme must be activated. b. GDP is exchanged for GTP. c. The receptor forms a dimer. d. The insulin molecule is internalized in the cytoplasm.
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